The first time travel fic I ever read was 'Somwhere I Have Never Travelled Gladly Beyond' by Strangefellows. The fanfic actually made me start to love time travel fics, which I previously hated
Despite being a WIP (and unfortunately, has not been updated since I last checked
), it's a quite great fic where Spike is sent back to BTVS season 1 after spending a bit of time in hell after closing the Hellmouth
I don't know if I've linked this properly, but click
here for the fic
Summary: Realizing a little too late that they might have gotten the wrong Champion, the Powers That Be decide to give Spike a do-over, as it were. Replace him -- as he was when he sacrificed himself in the Hellmouth -- into the Slayer's story, right at the beginning, and let him do his job right. Of course, that's not going to be easy. But since when was anything easy in Sunnydale?